Signaling means.



E. J. BURKE.

SIGNALING MEANS. APPLICATION FILED MB. 2a, 1908.

Patented Jan. 18,1910.

WITNESSES .mvEw ron E. J. BURKE.

SIGNALING MEANS.

APPLIOATION FILED MAR. 26, 1908. Paten ted Jam 18,

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WITNESSES INVEIITOH I 915W gfivu/md 61%;

.4 TTOIHI E. J. BURKE.

SIGNALING MEANS.

' APPLICATION FILED MAR. 26, 1908. 946,957, Patented Jan. 18,1910.

4 SHEETS-SHEET 3.

WITNESSES my TOR F4 6. W 6

ATTORNEY E. J. BURKE.

SIGNALING MEANS.

APPLICATION FILED MAR. 26, 1908.

Patented Jan. 18, 1910.

4 SHEETS-SHEET 4.

WITNESSES VfCW UNITED STATES PATENT or EDWARD J. BURKE, OF NEW YORK, N.Y., ASSIGNOR OF ONE-HALF TO JOHN Q. A. WHI'ITEMORE, OF NEWTON,MASSACHUSETTS.

SIGNALING MEANS.

To all whom it may concern:

Be it known that I, EDWARD J. BURKE, a citizen of the United States, anda resident of the borough of Brooklyn, New York, county of Kings, andState of New York, have invented certain new and useful Improvements inSignaling Means, of which the following is a specification.

My invention relates to a means for producing signals in an electricsystem.

It more particularly relates to a means for enabling a subscriber of atelephone system to signal the operator at the central station.

The invention consists in a plurality of signaling devices, and a devicefor causing one of the signaling devices to operate.

The invention also consists in providing a plurality of electricsignaling devices, a switch for controlling each signaling device, and adevice controlled by the said switch for causing one of the signaling devices to operate.

The invention consists in providing a plurality of electric signalingdevices, a device for causing the signaling device to operate, switchesadapted to be operated by the subscriber of a telephone system whichcontrols the said devices, and switches adapted to be operated by theoperator for restoring the said device.

The invention consists in other features illustrated in the drawings,and described in this specification and set forth in the claims.Referring to drawings forming a part hereof Figure 1 is a diagrammaticillustration of my invention showing the electrical connections betweenthe various parts thereof. Fig. 2 is a diagrammatic illustration of theinvention as applied to a multiple system which requires a number ofoperators to attend to the calls of the subscribers. Fig. 3 is amodification of the multiple system shown in Fig. 2. Fig. 1 is anillustration of the circuit controller. Fig. 5 is an illustration of acontact plate. Fig. 6 is an illustration of one of the clutch plates.Fig. 7 is an illustration of the stopping and starting magnet, whichcontrols the circuit closers either single or multiple. Fig. 8 is adetail sectional view of one of the circuit closers.

Referring to Fig. 1, 1 and 2 are subscribers stations having theinstruments which are commonly found at such stations, and

Specification of Letters Patent.

Application filed. March 26, 1908.

Patented J an. 18, 1910.

Serial No. 423,487.

which are well known in the art. 3 and 1 are switch hooks. 5 and 6 arecontacts. 7 and 8 are transmitters. 9 and 10 are telephone receivers. 11and 12 are condensers. 13 and 14 are bells.

The subscribers stations are connected to the central station by lines14 and 15 and 16 and 17. The lines are connected to the jacks 18 and 19.Line 14 is connected to the contact 20 and line 17 is connected to thecontact 21. Line 15 is connected to ring 22 of the jack 18 and line 16is connected to ring 23 of the jack 19.

The ring 22 is connected through the con tact 24 to the controllingmagnets which control the circuit closer which is used for closing thecircuits of the signaling means associated with each of the jacks. Thering 22 is connected with the battery 25, through the contact 24:. Thebattery 25 is connected to the magnet 26, which is in turn connectedwith the line 1 1 through contact 20. In the same way line 16 is alsoconnected with the battery 25 and the line 17 is connected with themagnet 26. All of the lines of the system are connected with the saidbattery and the said magnet.

The controlling magnet 26 operates to close a local circuit having thebattery 27. The current of the battery 27 energizes the magnet 28. Thearmature of the magnet 28 is a pawl 29 and the pawl 29 operates so as toengage with the teeth of ratchet wheel 30 which is connected with themotor 31. The motor 31 may be electrically operated or may be operatedin any other way, the function of the magnet 28, the pawl 29 and theratchet wheel 30 being merely to start and stop the motor. Any othermeans may be used to accomplish this result.

A shaft 32 is connected to the motor 31. A disk armature 33 is connectedto the shaft 32 and is movable longitudinally along the shaft for ashort distance. The armature 33 is operated by the magnet 34, which isconnected in a local circuit having a battery 35. The magnet 34 iscontrolled by the magnet 36. The magnet 36 is connected to the battery25 and to the spring contact 37 which rubs upon the shaft- 32 as it isturned by the motor. A spring contact arm 38, is attached to thearmature 33 and is moved over two sets of contacts one of one set be ingconnected with the signaling device which indicates the calls of thatsubscriber to the central operator. The spring contact 38 makes contactwith one of each set at the same time and during the rotation of thecontact 38 while being carried by the shaft 32, it makes contact withall of the contacts of the two sets. This is shown in Figs. 1 and 5which will be described hereinafter. The contact 38 is flexible so thatwhen it is raised by the operation of the magnet 3ft it will retain itselectrical connection with a contact of each set.

Each contact 39 of one set is connected with a contact 2 1. Each contact40 of the other set is connected with an electric lamp 41, each lamp isassociated with the ack connected with contact 39, the two contacts 39and 10 being closed at the same time by contact 38. A branch circuitcontaining the magnet 36 is closed by the arm 38 and each contact 39.This circuit is in multiple with the resistance coil 43. The resistance43 causes enough of the current of battery 25 to pass through andoperate the magnet 36. The electric lamps or the electric signalingdevices 11 are connected to the battery -12. The battery 12 is connectedto the armature 33 when it is raised by the operation of the magnet 31-.

The jacks of the subscribers are connected together by means of theplugs as and 45 in the manner well known in the art of telephony. Theplug circuits have the common battery 60, the induction coils 17 and thelistening and calling circuits that are usual in such cases. hen a plugis inserted in a jack the head of the plug makes connection with one ofthe subscribers lines and the ring of the plug makes connection with theother of the subscribers lines. hen a plug is inserted to makeconnection the head of the plug presses the contact 24: upward andbreaks connection with the line leading from the ring of the ack to thecontrolling magnets 26 and 36. The same is true of contact 20. Thecontacts 24 are provided with insulated portions 46 which prevents anyelectrical connection between the plug and the contact 2a.

\Vhen a subscriber removes his telephone receiver from the switch hookor when the circuit closer or switch 35 is closed a circuit is completedfrom the battery 25, resistance 13, contact 24:, lines 15 and 14c,magnet 26, back to battery 25. The magnet 26 then closes the circuit ofthe battery 27 and the magnet 28 starts the motor 31 going. The contact38 is carried around making contact with the pairs of contacts 39 and10, until it reaches the particular contact 39, which is connected withthe subscriber who has removed his telephone receiver. hen this is done,a circuit is completed through the branch circuit having the magnet 36,contacts 37, 38, and 39. The current is directed through the branch byreason of the resistance 41-3 which is in multiple. T he magnet 36 thenoperates and closes the local circuit of the battery 35 which energizesthe magnet 34. This uncouples the armature 33 from the shaft 32 bylifting the armature 33 so that the coupling pin 52 will clear the plate50. This brings the contact 38 to a stand still and in contact with thecontacts 39 and 10 connected with that part of the system allotted tothe use of that particular subscriber.

hen the armature 33 is raised, the circuit of the battery 42 is closedthrough the contacts 38 and t0 and the electric lamp 11. The lamp Allbeing in the vicinity of the jack 18 of the calling subscriber itimmediately indicates to the operator that that subscriber is calling.The operator thereupon inserts a plug 4e into the jack 18 and makes theusual inquiries as to number desired. The operator then inserts plug 415in the jack of the subscriber called for.

When the operator inserts the plug 4-1 into the ack 18, the head of theplug breaks the connection of the ring with the controlling part of thecircuit closer, that is, the circuit through the magnet 36 is broken andalso the circuit through the magnet 26 is broken. This causes the magnetto drop the armature and permit its recon nection to the shaft and alsothe magnet 28 is deenergized which stops the motor. This places themechanism in the same condition that it was in when the subscriber firstclosed the switch 35.

If another subscriber is calling while the first one is being served,and before the plug is inserted in his ack, the arm 38 will upon theinsertion of the plug into the jack move to the contact 39 connected tosuch other subscriber that may have thus called. The magnet 3% permitsreconnection of the armature 33 and the shaft and the magnet 28 permitsthe motor to continue in its operation until the contact 38 reaches thecontact 39, which is connected with such other subscribers line. Themagnet 34. will then be energized as before and the contact 38 will bebrought to a standstill as before. At the same time electricalconnections will be established through the battery -12 and the electriclamp which is associated with the jack of such other calling subscriber.Thereupon the operator will then serve the said other calling subscriberin response to the lighting of the lamp.

The shaft 32 may be operated so as to revolve the contact 38 about itsaxis at any desired speed.

In Figs. 2 and 3, I have illustrated diagrammatically multiple systems.The systems are modifications of each other. The device used inconnection with the multiple systems is shown in Fig. t. The same device shown in Fig. 4 is also used in the multiple system shown in Fig. 3except for a slight modification of the circuit closer shown in Fig. 8.

Referring to Fig. 4, 31 is a motor mounted on one end of the cylindricalbox 49. The shaft 32 extends through the'oblong frame 49, and isconnected with the motor 31. The magnet 28 operates the pawl 29 whichreleases and holds the ratchet 30 and thus they operate to start andstop the motor. This is shown in detail in Fig. 7.

A plurality of coupling plates 50 are con nected to the shaft 32. Thecoupling plates 50 have in each case a plurality of holes 89. This isshown in detail in Fig. 6. A plate 51 is located above each plate 52 andis movable along the shaft 32. The plates 51 have in each case a pin 52.lVhen a plate 51 is allowed to slide down the shaft 32, the pin 52enters one of the holes 89 of the coupling plate 50 located below, sothat the plates when thus located with respect to each other are coupledtogether and positively CO11- nected to the shaft 32. A sleeve 53 is ineach case connected to the coupling plate 51. To the sleeves 53 areattached the disk armatures 33, 73, 74 and 75. The armatures move inproximity to the magnets 34, 70, 71 and 72. The contacts 38, 67, 68 and69 are connected to the disk armatures which are turned by the shaft 32.The magnets are supported on a frame or crosspiece 55 which is attachedto the sides of the main frame.

Annular plates 56 are connected by the uprights 57 to the frames 55. Thecommutator plates 56 are supported below the switch contacts and arepreferably made of insulating material in order that they may insulatethe contacts which are mounted. thereon. One of the annular plates 56 isshown in detail in Fig. 5. Contacts 58, 76, 77 and 78 are also mountedon the plates 56. The contacts are spring contacts and are so locatedthat when the armatures are raised the plates 51 make connection withthe contacts. This closes a circuit through the battery and to one ofthe signaling devices connected to the plate on which its contact ismounted.

37 is a spring contact which makes electric connection with the shaft32. The electrical connection is completed through any of the sleeves53, armatures 33, 73, 74, 7 contacts 3s, 67, 0s, 69.

The multiple system illustrated diagrammatically in Fig. 2 have the sameconnections between the instruments at the subscribers stations and thesame connection with the central stations. The system here is to bepreferably used in connection with a multiple board system, the jacksbeing multiplied to the several boards in the well known manner. Theconnections are substantially the same except in so far as it isnecessary to control the circuit closer for operating the signalingmeans. A pli 'ality of switch arms 38 are provided as explained inconnection. with Fig. 4, and the switch arms 38 have a plurality ofcoupling plates which are adapted to couple the switch arms to the shaft32 for causing them to revolve and make contact with the fixed contactslocated on the plurality of contact plates 56.

The multiple system is divided into sections, that is, the subscribersare divided into groups so that a number of subscribers may have theirsignaling circuits controlled by one of the revolving circuit closers.

As described in connection with Fig. 1, in the multiple system line 14is connected to the magnet 26, and the line is connected to the contact39, and the resistance 43, and the battery 25. The magnet 36 isconnected in a branch circuit to the circuit of the resistance 43. Thecircuit of the magnet 36 is completed through the contact 37 shaft 32,contacts 38 and 39, lines 15 and 14, back to the battery 25.

The subscribers station 2 is connected to a. second contact plate andits signaling circuit is controlled by another switch arm. Thesubscribers of the section of the system to which the subscriber 2 isapportioned are connected to the battery 62, and the magnet 63. Themagnet 63 operates in the same way that magnet 26 operates. Thearmatures are connected in multiple so that when any of the magnets likemagnets 26 and 63 operate the circuit of the battery 27 will be operatedand the motor 31 will be permitted to rotate the shaft 32. A magnet 64similar to the magnet 36 is provided for controlling the contact 67, ofthe section of the system to which the subscriber belongs. The magnet 64is also located in a circuit which branches from the circuit of the mainline leading to the subscribers station. It is also connected to thecontact 37 and is completed through the contacts 67 and 39, which whenclosed is in multiple with the resistance 43. hen the contact 67 makescontact with the contact 39 connected to the subscribers station 2, ifthe switch 4-6 is closed the magnet 64 will be energized by the currentof the battery 62, passing through the mag net 64, contact 37, contact39, lines 16 and 17, magnet 63 back to the battery. This will cause themagnet 76 to be energized. This will raise the armature 73 and thecircuit will be closed through the contact 76, battery 42, lamp 41,contacts and 67. This will cause the lamp 41 to indicate to the operatorthat subscriber 2 is calling, the plug will then be inserted by theoperator and inquiry made as to the number called for. The operator willthen complete the connection with the other plug in the manner wellknown in the art.

If the two subscribers call at the same time, the magnets 26 and 63 willbe operated which will cause the motor to start or if either one of thesubscribers call first one of the magnets will start the motor. Thecontacts 38 and 67 will continue to rotate independently until they comein contact with contacts 39 which are connected with subscribers whohave closed the circuits of their lines. The switch arm 38 may thus beused to keep one of the operators busy in attending to the calls of thesubscribers connected to the contact plate which is swept by the switcharm 38 and another operator may be kept busy by the switch arm 67. Anyarrangement, however, may be made. One switch arm may be used to keeptwo or any number of operators busy. All that is done by the operator isthat as soon as an electric light appears, the operator inserts a plugin the jack associated with the lighted lamp. The switch arm immediatelygoes to the next contact which is connected with a calling subscriber.It reaches this contact in a small fraction of a second, and thereremains until the operator has served the first subscriber and connectedthat subscriber with the subscriber called for. Meantime anotheroperator of another board may insert a plug into the jack of the secondcalling subscriber. It is obvious that one contact 38 can keep severaloperators busy.

In the modification of the multiple system shown in Fig. 3, the battery25 is made common to all of the subscribers of the multiple system.

In the modification shown in Fig. 2, the batteries like 25 and magnetslike 26 are common only to the subscribers of any one group into whichthe multiple system may be divided. In the system shown in F 2 a commonconnection can be made for the entire system through contact 37, andshaft 32 which leads to the circuit closers like that marked 38. In thesystem shown in F 3, the circuit closers like 38 are insulated from eachother, and connections therewith are also necessarily insulated fromeach other. This is accomplished by insulating the disk armatures,sleeves, and coupling plates like those marked 33, 53, 51 and 50 fromthe shaft 32. This is shown in detail in Fig. Fig. 8 is an illustrationof one of the sections of the device shown in Fig. 4, when the device ismodified and used in order that it may be used in connection with asystem like that illustrated in Fig. 3. The sleeve 53 is provided withan inside bearing sleeve 82 of metal which is adapted to allow the shaft32 to rotate when the circuit closer 38 is to be held stationary, andwhich is also adapted to be moved longitudinally along the shaft 32 uponthe operation of the magnet 34:. An insulated sleeve 83 is locatedbetween the sleeves 82 and 53. The sleeve 83 operates to insulate thecircuit closer 38 and prevent the currents that pass therethrough fromentering the shaft 32.

The pin may be insulated or the coupling plate 50 may be insulated fromthe shaft 32 in order to prevent electrical connection between the shaftand the circuit closer 38. In the device illustrated, the coupling plate50 is insulated from the shaft 32. It is insulated in the same way thatsleeve 53 is insulated. A sleeve 84L is secured to the shaft 32, and theinsulated sleeve 85 is located between the sleeve 84 and the plate 50.The contact 38 is electrically connected with one of the externalcircuits through the contact 80, which is mounted on the insulated plate56. The contact is a spring contact and permits the sleeve 53 to rotateor to move along the shaft 32.

Referring to Fig. 3 wherein the battery 25 and the magnet 26 may be usedby all the subscribers of the system, controlling magnets and batterieslike 63 and 62 are done away with but the relay magnet-s 36 and 64 areunder the control of the subscribers of the group with which each magnetis associated. The magnet 36 controls the magnet 34: and the magnet 64.controls the magnet 70.

\Vhen a subscriber closes his switch the magnet 26 is energized and themotor 31 operates the shaft 32. The shaft 32 carries with it all of thecircuit closers until the circuit closer which is controlled by thegroup to which the subscriber is apportioned reaches the contact 39,connected to the subscribers line. The magnet 34 will then uncouple thecircuit closer from the shaft and the circuit closer will come to astandstill in contact with contacts 39 and 40. At the same time theuncoupling magnet will connect the contacts 38 and 40 with the battery42. The current will then pass through the lamp ll which is associatedwith the jack of that subscriber. The lighting of the lamp indicates tothe operator that the subscriber is calling, and the operator inserts aplug in the subscribers jack and establishes a connection as describedbefore.

The connection of the relay magnet 36 is completed through the contact80, the circuit closer 38, and the contact 39 which is in multiple withthe resistance 43. It is further completed through the switch 35 at thesubscribers station when the subscriber removes the telephone receiver,or otherwise closes the switch.

The circuit of the relay magnet 6 L is completed through the contact 81,circuit closer 67, and contact 39. It is further completed upon theoperation of the switch 4-6. The operation of either of the switches orl-6 will cause the magnet 26 to start the shaft which carries thecircuit closer and the operation of one of the switches will cause themagnet 84 to stop the circuit closer 3S, and the switch -l6 will causethe magnet to stop the circuit closer 67. This will cause the lampetl ineach case to become lighted, and give the necessary indication to thecentral operators.

The invention may be modified by those skilled in the art withoutdeparting from the spirit thereof.

I have merely shown or described two or three embodiments of myinvention.

The invention may be used in connection with calling systems of variouskinds and the connections of the devices may be varied while the gist ofthe invention may be still involved.

W hat I claim as new, and desire to secur by Letters Patent is asfollows:

1. In a signaling means the combination of a plurality of signalingdevices, a switch and a jack for controlling the circuit of each of thesaid signaling devices, a. circuit closer, means for causing the saidcircuit closer to close the circuit of any signaling device upon theoperation of the switch and to operate on the circuit of the saidsignaling device upon the operation of the said jack.

2. I11 a signaling means the combination of a plurality of signalingdevices, a switch and a jack for controlling the circuit of eachsignaling device, plugs for connecting the said jacks together, acircuit closer, means for causing the circuit closer to operate upon thecircuit of any one of the said signaling devices upon the operation ofthe said switch, and to again operate 011 the circuit of the signalingdevice upon the insertion of a plug into the associated jack.

3. In a signaling means the combination of a plurality of electricsignaling devices, a plurality of circuit closers a switch and a jackfor controlling the circuit closer of each signaling device, means forcausing one of the said circuit closers to close the circuit of any oneof the said signaling devices and for opening the circuit upon theoperation of the said jack independent of the operation of the other ofthe said circuit closers.

4. In a signaling means the combination of a plurality of electricsignaling devices, a plurality of circuit closers, a shaft for operatingthe said circuit closers, a switch for controlling the circuit of eachcircuit closer and the operation of the said shaft, means for causingeach circuit closer to uncouple from the shaft upon the operation of thesaid switch.

5. In a signaling means the combination of a plurality of electricsignaling devices, a circuit closer, a shaft for operating the saidcircuit closer, a switch for controlling the operation of the said shaftand the circuit of each signaling device, means for f causing the saidcircuit closer to uncouple from the said shaft and close the circuit ofthe said signaling device upon the operation of the said switch.

6. In a signaling means the combination of a plurality of electricsignaling devices, a plurality of circuit closers, a shaft for operatingthe said circuit closers, a switch for controlling the operation of thesaid shaft and each of the said signaling devices, a jack forcontrolling the circuit of each of the said signaling devices and thesaid shaft, plugs for connecting the said jacks, means for causing thesaid shaft to rotate and the circuit of the signaling device to beoperated upon upon the operation of the said switch and for coupling thesaid circuit closers to the said shaft upon the insertion of the saidplug into the said jack.

7. In a signaling means the combination of a plurality of electricsignaling devices, a plurality of circuit closers, a shaft operating thesaid circuit closers, a means for 0011- trolling the circuit of eachcircuit closer and the operation of said shaft, means for causing eachcircuit closer to uncouple from the shaft upon the operation of the saidmeans.

8. In a signaling means the combination of a plurality of electricsignaling devices divided into groups, a plurality of circuit closers,each circuit closer adapted to close the circuits of all of thesignaling devices of one of said groups, a device adapted to operate anynumber of the said circuit closers during the same time, means forcausing a circuit closer to close but one cir cuit of a signaling deviceindependently of the operation of the other circuit closers.

9. In a signaling means the combination of a plurality of electricsignaling devices, a plurality of circuit closers, a shaft for operatingthe said circuit closers, a device for uncoupling each circuit closerfrom the said shaft and for closing a circuit of any one of the saidsignaling devices independently of the operation of the other of thesaid circuit closers.

10. In a signaling means the combination of a plurality of signalingdevices, a circuit closer, controlling devices for controlling the saidcircuit closer, means for causing the said circuit closer to close thecircuit of one of the said controlling devices and means for causing thesaid circuit closer to complete the circuit of the selected signalingdevice when it has completed the circuit of the said controlling device.

11. In a signaling means the combination of a plurality of signalingdevices, a circuit closer, controlling devices for controlling the saidcircuit closer, means for causing the said circuit closer to beconnected to the said controlling device upon the operation of the saidcontrolling device and automatic means for causing the said circuitcloser to complete the circuit of a signaling device when it has becomeconnected to the said controlling device.

12. In a signaling means the combination of a plurality ofsignalingdevices, a circuit closer, controlling devices for controllingthe said circuit closer, means for causing the said circuit closer tocomplete the circuit oi one of the said controlling devices upon theoperation of the said controlling device and means for causing thecircuit closer to complete the circuit of the associated signalingdevice when the said circuit of the controlling device is completed bythe circuit closer.

13. In a signaling means the combination of a plurality of electricsignaling devices, a circuit closer, two controlling devices associatedwith each signaling device and for controlling the said circuit closer,one of the said controlling devices adapted to cause the circuit closerto complete the circuit of the said controlling device and means forcausing the circuit closer to complete the circuit of the associatedsignaling device, the other of said controlling devices adapted to causethe circuit closer to open the circuit of the signaling device.

let. In a signaling means the combination of a plurality of electricsignaling devices, a circuit closer, two controlling devices associatedwith each signaling device and for controlling the said circuit closer,one of the said controlling devices adapted to cause the circuit closerto complete the circuit of the said controlling device and means forcausing the circuit closer to complete the circuit of the associatedsignaling device, the other of the said controlling devices adapted tocause the circuit closer to open the circuit of the signaling device andto disconnect the said circuit closer from the control of the first ofthe said controlling devices.

15. In a signaling means the combination of a plurality of electricsignaling devices, two controlling devices for controlling the circuitof each of the signaling devices, a circuit closer adapted to close thecircuit of one of the said controlling devices, one of the saidcontrolling devices adapted to cause the circuit closer to complete thecircuit of its signaling device and the other of the said controllingdevices adapted to cause the circuit closer to open the circuit of thesaid signaling device.

16. In a signaling means the combination of a plurality of electricsignaling devices arranged in a plurality of groups, a circuit closerassociated with each group, a device for causing any number of the saidcircuit closers to operate during the same time, means for causing thecircuit closer of each group to close but one circuit of a signalingdevice of its group independently of the operation of the other of thesaid circuit closers.

17. In a signaling means the combination of a plurality of electricdevices, a circuit closer, a pair of switches for controlling the saidcircuit closer, means for causing the said circuit closer to completethe circuit to one of the said switches and a means for completing thecircuit of the signaling device associated with said switch and to openthe circuit of the said signaling device upon the operation of the otherof the said switches.

18. In a signaling means the combination of a plurality of signalingdevices, a switch and jack, a circuit closer controlled by the saidswitch and jack, means for causing the said circuit closer to becomeconnected with the said switch and jack and means for causing the saidcircuit closer to complete the circuit of a signaling device.

19. In a signaling device the combination of a plurality of electriclamps, a switch and jack associated with each of the said lamps, acircuit closer having a contact adapted to make connection with the saidswitch, jack and lamps and means for causing the said circuit closer tocomplete the circuit of a lamp associated with an operated switch and tobe disconnected from the said lamp and switch upon the operation of thesaid jack.

In testimony whereof, I have signed n y name to this specification, inthe presence of two subscribing witnesses.

EDIVARD J. BURKE.

IVitnesses F. F. CRAMPTON, E. A. I'IENNESEY.

